[schakravarthy]

Originally Posted by DerAlte

Glass wool ('fiber glass') was used earlier, but now one uses 'Poly-fill' or synthetic wool - a variety of which is used to fill cushions and pillows. It is wool (as in raw thin fibers, not spun) made from a polymer.

I'm even more confused now! The glass wool that I remember resembled cotton candy. How can one stuff that directly into the door innards? Won't it hamper the controls? Also, what prevents gravity from acting on it?

Originally Posted by DerAlte

In that budget…

You misunderstood. I was talking about the material cost of neoprene rubber, foam and glue that I require for my fix. Not my target spend.

[::CMS::]

Originally Posted by schakravarthy

Agreed Sir. But don't you feel what I said is similar?

Method is same, but the density and mass of the material are different. The neoprene rubber sheet which I am aware of is very less dense and mass than the other materials mentioned.

Btw, what's the size and weight of the sheet?

It comes in rolls and I bought a 20mtr x 4ft roll
It weighs ~100gms (1.5mm thick) per sqft

I felt that the rubber will take care of the higher frequencies and the 2 layers of foam will filter the lower frequencies.

If you are looking for sound absorption for the speakers, then its only a myth.

Can you please share more details of 'Synth wool'? It sounds interesting.

http://www.anutone.com/panelling/synth
It composition is different than the polyform used in upholstery. It has an NRC of ~.6 to .7 (for a 600gsm and 1.5" thick)
I used the left over from my HT room

Rs.3.5k max

I spent ~1200/- for the bitumen sheet full roll (for the front doors I might have spent ~600/-), fevicol SR : 150/-, DIY effort, altogether ~750-800/- for the front doors and the result is far better damping than the commercial ones.

[schakravarthy]

Originally Posted by ::CMS::

If you are looking for sound absorption for the speakers, then its only a myth.

Its not about the ICE. The aim is to make the cabin silent. Main area of concern is the engine noise.

[::CMS::]

Originally Posted by schakravarthy

Main area of concern is the engine noise.

It can create issues during rainy season or during washing, water will get collected. Also excessive heat will degrade the foam in long run.

[schakravarthy]

Originally Posted by ::CMS::

It can create issues during rainy season or during washing, water will get collected. Also excessive heat will degrade the foam in long run.

They are water resistant, that much I know for sure. The local upholsterer, from whom I'm buying the material, says he uses these sheets regularly in Jeep engine bays. He swears they are heat resistant. He calls them thermo-foam. I'm not sure how accurate the name is though. Anyone know its proper industrial name?

[khoj]

To reduce engine noise ingress, you will have to apply sound absorption/deadening material to the firewall and in case it is a Diesel engine or a European petrol engine then the inner side of the bonnet too.

That however will not take care of the road and tire noise intruding in to the cabin. For this the floor pan, kick panels, parcel tray, area beneath the rear seat, the boot lid, boot floor and the rear number plate in addition to the door panels will need to be covered. Ciao

Originally Posted by schakravarthy

Its not about the ICE. The aim is to make the cabin silent. Main area of concern is the engine noise.

[schakravarthy]

Originally Posted by khoj

To reduce engine noise ingress, you will have to apply sound absorption/deadening material to the firewall and in case it is a Diesel engine or a European petrol engine then the inner side of the bonnet too.

That however will not take care of the road and tire noise intruding in to the cabin. For this the floor pan, kick panels, parcel tray, area beneath the rear seat, the boot lid, boot floor and the rear number plate in addition to the door panels will need to be covered. Ciao

Firewall is definitely in my to-do list. I'm trying to figure out if it can be a DIY, or if I need to bribe a Fiat technician for a Sunday 'consultation'.

Road and tyre noises are not a major concern for me. The cabin is pretty silent even now, it's just the diesel rattle that's driving me to opt for such measures. Plus, if I choose to reinforce the floor area, I'll have to tear apart the floor mat that I have.
So, its just the 5 doors, spare wheel well, firewall and as you pointed out, inner side of the bonnet.

[SunnyBoi]

Originally Posted by schakravarthy

Firewall is definitely in my to-do list. I'm trying to figure out if it can be a DIY, or if I need to bribe a Fiat technician for a Sunday 'consultation'.

Road and tyre noises are not a major concern for me. The cabin is pretty silent even now, it's just the diesel rattle that's driving me to opt for such measures. Plus, if I choose to reinforce the floor area, I'll have to tear apart the floor mat that I have.
So, its just the 5 doors, spare wheel well, firewall and as you pointed out, inner side of the bonnet.

Its actually the opposite regarding the firewall and floor.

I had taken off my dashboard for AC Servicing and thought I'd paste these sheets everywhere on the firewall for additional soundproofing. It turns out that the mats behind the dash is fiarly complex shaped and very easy to tear off. Plus there was already lot of soundproofing material so left it as-is.

Floor mats can be removed and put back without tearing though.

[schakravarthy]

Originally Posted by SunnyBoi

Its actually the opposite regarding the firewall and floor.

I had taken off my dashboard for AC Servicing.

Now I know where to come for dashboard removal!

[khoj]

I see you have a Punto, which is generally very silent and infact has less road noise ingress compared to say my TJet.

I would very strongly recommend against removing the Punto's dashboard. I have seen a Linea with it's dash removed and the area behind is occupied by a nearly 3" dia anti collision beam/bar. This also acts as a support for mounting the dash. Rest of the area is full of various wire harnesses, air conditioning channels and control module for the MID etc. Punto would be similar, so you will not be able to insulate that area at all.

It is best to damp the area beneath the dash, this will be simpler and the carpet in the Fiat is easily remove able. For the bonnet' sinner side you can obtain the damping material that comes with the Emotion and Sports variant from Fiat itself.

Originally Posted by schakravarthy

Firewall is definitely in my to-do list. I'm trying to figure out if it can be a DIY, or if I need to bribe a Fiat technician for a Sunday 'consultation'.

Road and tyre noises are not a major concern for me. The cabin is pretty silent even now, it's just the diesel rattle that's driving me to opt for such measures. Plus, if I choose to reinforce the floor area, I'll have to tear apart the floor mat that I have.
So, its just the 5 doors, spare wheel well, firewall and as you pointed out, inner side of the bonnet.

[schakravarthy]

Originally Posted by khoj

For the bonnet' sinner side you can obtain the damping material that comes with the Emotion and Sports variant from Fiat itself.

I thought it was the same across all variants. Mine is a '09 model MJD Emotion (not 'Pack'). Will mine be different from the current spec?

[khoj]

I don't think it will be any different from the current models. As for the variants, i did not know that all of them came with damping.

Originally Posted by schakravarthy

I thought it was the same across all variants. Mine is a '09 model MJD Emotion (not 'Pack'). Will mine be different from the current spec?

[DerAlte]

Originally Posted by schakravarthy

I'm even more confused now! The glass wool that I remember resembled cotton candy. How can one stuff that directly into the door innards? Won't it hamper the controls? Also, what prevents gravity from acting on it? ...

Gravity does act on it, but not enough to bring down the very light, loosely interwoven fibers, especially when glued on as a thick lamina.

Perhaps @::CMS:: can post a few pics of his door innards for a better understanding?

Originally Posted by schakravarthy

... You misunderstood. I was talking about the material cost of neoprene rubber, foam and glue that I require for my fix. Not my target spend.

Did I?

Originally Posted by schakravarthy

They are water resistant, that much I know for sure. The local upholsterer, from whom I'm buying the material, says he uses these sheets regularly in Jeep engine bays. He swears they are heat resistant. He calls them thermo-foam. I'm not sure how accurate the name is though. Anyone know its proper industrial name?

There is a similar material used for thermal insulation in HVAC installations. It is a dense foam similar to Yoga mats. I think it is rated to high enough a temperature that it will not melt in the engine compartment (which sees local temperatures upto 60-65C).

IIRC there is a reference to this material either earlier in this thread, or in a thread in the DIY section.

[schakravarthy]

Originally Posted by DerAlte

...very light, loosely interwoven fibers, especially when glued on as a thick lamina.

Is this that?

[Ragul]

Greetings
I got a lovely Chinese made material for stitching a new soft top for my Gyspy. But it is too thin by a few mm than the original factory soft top. Got a rubberized coating on the inside. I am thinking of pasting a damping material all along on the inside to make it thicker and also add some sound proofing.

What material do you recommend? Since it will be my inside roof anything shiny silver metallic finish cannot be used.

Ideally I would like to paste it on the inside completely and the soft top material cut and stitched after that. But if thats not possible, I will just stick it on the inside after it has been cut and stitched to shape. Of course I'll depend on the soft top tailor to do it. I just need some 1x1 feet samples to show him first and get his opinion on what is feasible.

Thanks for any suggestions.

--R